“Our hearts go out to the family, friends, and colleagues of Captain Halye,” the airline said in a statement.

When asked about the company’s drug testing policy by CNN, an airline spokesman declined to comment. He also declined to comment on when Halye was last tested for drugs.

A county coroner’s investigator says the preliminary cause of death appears to be an overdose of fentanyl, an opiate many times more powerful than heroin. Centerville police say drug paraphernalia was found inside the home.

The final cause of death remains undetermined pending results from toxicology testing, said Ken Betz, director of the Montgomery County Coroner’s Office.